How to choose the frequency of induction heating hardened gears?

When the induction heating gear is quenched, the shallower the hardened layer is according to the requirements of the workpiece, the higher the frequency should be.

For example: below 1mm, UHF 100-500KHZ can be used;

1-2.5mm, super audio 20-100KHZ;

Above 2.5mm, intermediate frequency 1-20KHZ.

The higher the frequency, the greater the surface current density and the smaller the current penetration depth. The lower the frequency, the greater the depth of current penetration

0.5mm use high frequency 200-250KHZ

5～10 mm use intermediate frequency 1-20KHZ

Use power frequency over 10mm